CARRIER CONCENTRATIONS AND RELAXATION SPECTROSCOPY - NEW INFORMATION FROM SCALING PROPERTIES OF CONDUCTIVITY SPECTRA IN IONICALLY CONDUCTING GLASSES

A new kind of scaling analysis for the conductivity spectra of glasses without any arbitrary parameters is presented. By applying this metho d to sodium berate glasses of different compositions, we find strong i ndications for the existence of a universal ionic relaxation process a s well as for a strong electrolyte behavior. Our results enable us to show that the often used electric modulus formalism is misleading when relaxation mechanisms on a microscopic level are concerned. A more me aningful discussion can be based on the log-log dependence of the cond uctivity on frequency.